-- Discussion containing changed information from previous version are highlighted. --
679
FXUS61 KRLX 212351
AFDRLX

AREA FORECAST DISCUSSION
National Weather Service Charleston WV
751 PM EDT Sat Sep 21 2024

.SYNOPSIS...
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Valley fog tonight. Drying out for the remainder of the
weekend, then growing unsettled next week.
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&&

.NEAR TERM /THROUGH SUNDAY/...
As of 121 PM Saturday...

A cold front is currently tracking eastward over southeast Ohio
at the time of this writing, and is expected to pass through
our region this evening. Ahead of the front will be isolated
showers and thunderstorms, with a marginal chance of severe
thunderstorms over the northern WV mountains. This area is just
downstream of a 500-mb vort. max. In addition, 0-6km bulk shear
and instability are slightly more favorable over the northern
mountains. The main threats of any stronger storms in this area
would be isolated damaging wind gusts and large hail.

In the wake of the frontal passage overnight, patchy dense fog
will develop in the river valleys, especially in places where
the ground is moist from rainfall today.

The hot and dry weather will return Sunday as a ridge moves back
over the middle Ohio Valley. There will be another concern for
increased fire danger across the WV lowlands and southeast Ohio.
Afternoon minimum RH values are expected to drop to 30-40%
Sunday afternoon. We will re-evaluate the fire threat early
Sunday morning as new data comes in to see if an SPS may be
warranted.

&&

.SHORT TERM /SUNDAY NIGHT THROUGH MONDAY NIGHT/...
As of 1230 PM Friday...

Ridging will begin to flatten and pivot east of our area at the
beginning of the period as a cold front pushes east into the Ohio
Valley. Low pressure associated with the warm frontal boundary will
bring the potential for showers/storms starting late Sunday night
into Monday and Monday night. High temperatures Monday will be in
the low to mid 80`s across the lowlands and as low as the low 60`s
across the mountains with high humidity as moisture plume advects
into the region from the south.

The system should provide some much needed rain for the area as we
continue to experience extreme drought. Rainfall amounts should
generally be under an inch per WPC QPF but isolated higher totals
are possible across the higher elevations to the east and any areas
that see repeated or heavier rainfall associated with thunderstorms.
There is also a very small risk for excessive rainfall, mainly along
and northwest of the Ohio River in our Ohio counties, which with our
drought conditions would seem to be merely beneficial.

SPC highlights no risk area for severe weather at this time but
there is a marginal to the west of our area that has been
matriculating eastward and could include western portions of the CWA
in the future, especially with instability trending upward (SBCAPE
1000-1500 J/kg) and increased bulk shear around 35kts for Monday per
12Z GFS and Euro so it will be something to keep an eye on as we
inch closer to Monday.

&&

.LONG TERM /TUESDAY THROUGH SATURDAY/...
As of 1230 PM Friday...

Low pressure and associated cold front will be approaching the area
at the beginning of this period sometime Tuesday, bringing
additional chances for some showers/storms. Forcing will be
increased with this feature and as such an increase in the potential
for showers and storms Tuesday compared to Monday. Instability
appears to also be around the same, perhaps a little higher in our
western lowlands compared to Monday, but it is still a little ways
out and any antecedent cloud cover or ongoing precipitation would
potentially hinder greater instability. Still something that should
be watched as the system approaches early this week but overall
dynamics aren`t that supportive outside of some instability.

QPF for Tuesday through early Thursday seems to be trending upwards,
especially across the lowlands where the Euro now places most of the
coal fields in a swath of around 2" of rain but the GFS keeps
rainfall totals at around .5-1.25" across most of the area which
either way would provide much needed precipitation for our drought
stricken county warning area. I will note, however, that the WPC has
most of the area under a marginal risk for excessive rainfall for
Tuesday and also has us at around the .5-1.25" range, so we will
need to keep an eye on the trends as the weekend progresses but with
the ongoing extreme drought, it seems that the risk for flooding
would be minimal at best. Precipitation chances should end rapidly
from west to east by Thursday morning, but some lingering showers
are possible across the mountains. Some models indicate moisture
will continue to linger over the area through the weekend but the
probability of that seems low.

Temperatures will be a little milder after the front moves through
but still in the low 80`s across the lowlands to mid 70`s in the
mountains for most locations with mainly pleasant weather for
the remainder of the period through Saturday as ridging once
again builds back into the region.

&&

.AVIATION /00Z SUNDAY THROUGH THURSDAY/...
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As of 745 PM Saturday...

As showers and storms diminish or exit the CWA, VFR conditions
are expected initially across the area. However, valley fog is
expected again tonight, with more locations impacted than recent
nights. The densest fog will occur in areas that have received
rain, such as EKN, CKB, and perhaps HTS. Fog forecast is least
certain for CRW, where no rain was recorded in the vicinity
today, but calm and clear conditions with increased overnight
dew points mean we can`t rule it out. Fog at PKB is also a bit
questionable, as they didn`t directly receive rainfall, but
there was some in the vicinity.

All fog should burn off between 12z and 14z Sunday, with a
partly to mostly sunny day expected, along with light winds.


FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 00Z MONDAY...

FORECAST CONFIDENCE: Medium.

ALTERNATE SCENARIOS: Timing and location of overnight fog will
vary from the forecast.

EXPERIMENTAL TABLE OF FLIGHT CATEGORY OBJECTIVELY SHOWS CONSISTENCY
OF WFO FORECAST TO AVAILABLE MODEL INFORMATION:
H = HIGH:   TAF CONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL.
M = MEDIUM: TAF HAS VARYING LEVEL OF CONSISTENCY WITH MODELS.
L = LOW:    TAF INCONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL.

DATE                                                            SUN 09/22/24
UTC 1HRLY       00   01   02   03   04   05   06   07   08   09   10   11
EDT 1HRLY       20   21   22   23   00   01   02   03   04   05   06   07
CRW CONSISTENCY  H    H    H    H    H    H    H    L    M    M    M    M
HTS CONSISTENCY  H    H    H    H    H    H    H    H    L    L    M    M
BKW CONSISTENCY  H    H    H    H    H    H    H    H    L    L    L    L
EKN CONSISTENCY  H    H    H    H    H    M    M    M    M    M    M    M
PKB CONSISTENCY  H    H    H    H    H    H    H    H    L    L    M    M
CKB CONSISTENCY  H    H    H    H    H    H    M    L    M    M    M    M

AFTER 00Z MONDAY...
Brief IFR possible in any heavier showers and thunderstorms
Monday afternoon through early Wednesday morning.
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&&

.RLX WATCHES/WARNINGS/ADVISORIES...
WV...None.
OH...None.
KY...None.
VA...None.

&&

$$

SYNOPSIS...28/RPY/JMC
NEAR TERM...JMC
SHORT TERM...28/RPY
LONG TERM...28/RPY
AVIATION...FK